Which book should I buy?

Hostaholics:
I'm staring at the Timber Press catalog trying to limit the number of book
I buy. I've seen both Diana Grenfell's and Paul Aden's hosta books at the
library and decided I wanted more. George Schmid's book looks like it might
be what I need (I like to get enough info to understand the botanical
relationships among plants), but it's way more expensive than the other 2
are. Is it any better? Is there another hosta book available from some
other publisher that would be better than any of the 3 mentioned? Comments
please.
Debby
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